Protecting a spin ensemble against decoherence in the strong-coupling regime of cavity QED
By S. Putz, D. Krimer, R. Amsuss, Abhilash Valookaran, T. Nobauer, Jörg Schmiedmayer, S. Rotter, J. Majer. Nature Physics, 2014
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Hybridized systems offer a promising route for developing quantum devices, but inhomogeneous broadening limits the practical use of large spin ensembles. Suppression of the decoherence induced by such broadening has now been demonstrated for a superconducting cavity coupled to an ensemble of nitrogen–vacancy centres in diamond. Hybrid quantum systems based on spin ensembles coupled to superconducting microwave cavities are promising candidates for robust experiments in cavity quantum electrodynamics (QED) and for future technologies employing quantum mechanical effects1,2,3,4. At present, the main source of decoherence in these systems is inhomogeneous spin broadening, which limits their performance for the coherent transfer and storage of quantum information5,6,7. Here we study the dynamics of a superconducting cavity strongly coupled to an ensemble of nitrogen–vacancy centres in diamond. We experimentally observe how decoherence induced by inhomogeneous broadening can be suppressed in the strong-coupling regime—a phenomenon known as ‘cavity protection’5,7. To demonstrate the potential of this effect for coherent-control schemes, we show how appropriately chosen microwave pulses can increase the amplitude of coherent oscillations between the cavity and spin ensemble by two orders of magnitude.
Subfields: Atomic and Molecular Physics, and Optics, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/3384cddf11a0bd983c8b51c01b7354b93eb3895c
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In Atomic and Molecular Physics, and Optics
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Citations in the corpus
- Colloquium: Strongly interacting photons in one-dimensional continuum (2016, background): “…are being studied including nitrogenvacancy centers in diamond (Amsüss et al., 2011; Grezes et al., 2014; Julsgaard et al., 2013; Kubo et al., 2011; Putz et al., 2014) and rare-earth ions, especially erbium (Afzelius et al., 2013; Bushev et al., 2011; Probst et al., 2013; Staudt et al., 2012).”